In aerodynamics what is induced drag

The composition of total Drag as it is shown below:

Thanks to DRAGBUSTERS... This document can solve this question, and analyses the drag in detail.

Profile Drag Definition: Profile Drag is the drag incurred from frictional resistance of the blades passing through the air. It does not change significantly with angle of attack of the airfoil section, but increases moderately as airspeed increases. Taken from here.

Definitions of profile drag as they are in dictionaries:

The portion of the wing drag that is due to friction and turbulence in the fluid and that would be absent if it were nonviscous

The part of the drag on an aerofoil or aircraft which arises directly from its profile and from skin friction (i.e. the part not attributable to lift).

By reading this...(in fifth par.)

Form Drag Definition: Drag which depends on the shape of the aircraft, is called form drag.

The following definition has been taken from here.

Profile Drag or, sometimes called form drag, is the drag caused by the separation of the boundary layer from a surface and the wake created by that separation. It is primarily dependent upon the shape of the object. Form or pressure drag is caused by the air that is flowing over the aircraft or airfoil.

And finally, the most commonly types of drag encountered are,

Parasitic Drag, composed of

Form Drag, which is the result of the aerodynamic resistance to motion due to the shape of the aircraft,

Skin Friction Drag, which is due to the smoothness or roughness of the surfaces of the aircraft, and

Interference Drag, which may occur where surfaces with different characteristics meet (e.g. wing and fuselage)

Induced Drag, which is a secondary effect of the production of lift,and

Wave Drag which comes into play when shock waves are developed close to the surface of the aircraft in transonic and supersonic flight.

Taken by this Skybrary Article which describes very nicely the types of drag.

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